What is vitamin DVitamin D is a fat-soluble vitamin that is naturally present in very few food sources. Its functions in the body are wide ranging, from contributing to bone health to supporting immune function.*Vitamin D3 (cholecalciferol) is the same form of vitamin D that the body manufactures when skin is exposed to ultraviolet (UV) radiation from the sun. Vitamin D3 may be more than three times as effective in raising concentrations of vitamin D in the bloodstream and maintaining those levels for a longer time.*How does vitamin D support healthContributes to bone strength as proper levels create optimum conditions for bone formation.*Supports proper functioning of the immune and nervous systems.*Promotes the intestinal absorption of calcium.*Supports fetal skeletal development and tooth enamel formation.*Contributes to healthy levels of phosphorus in the body.*Why choose Vitacost Vitamin D3Is the preferred form of vitamin D, identical to the type manufactured by the body when skin is exposed to UV sunlight.Ideal way to obtain vitamin D, as few foods contain vitamin D in sufficient quantity to meet Daily Value levels.Supplies 5,000 IU of vitamin D3 per 1-softgel serving.Contains 365 servings per bottle.Incredible value!About VitacostAll Vitacost products are laboratory tested to meet FDA standards for identity, purity and composition. All products are tested for heavy metals, microbiology and contaminants. Vitacost products are produced in a NSF Certified facility. Freshness is guaranteed. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.